Two women in Madison, Wisconsin were arrested Wednesday night after punching and threatening to kill a police officer who was responding to a 911 call about a nearby street brawl.

Within minutes of arriving on the scene, police said the officer attempted to arrest a woman he saw punch a man in the face but was quickly overwhelmed by a mob of people chanting anti-police slurs, including “We need to start killing these officers.”

Police said Nanyamka N. James, 20, attacked the officer in an attempt to free her mother, Latonya B. James, 40, WISCTV reported. The mother grabbed the officer by the throat and punched him in the face, according to a Madison Police Department press release.

One witness told police that they heard the mother repeatedly threatening to kill the officer.

The mother was arrested for battery to a law enforcement officer, possession of pepper spray, and resisting arrest, according to the Madison Police. Nanyamka N. James, who is on parole, was arrested for disorderly conduct and resisting arrest.